What amps does a garbage disposal draw?

This question gets asked for one of three reasons: you are working out whether an existing circuit can take a disposal, you are buying a cord or an outlet, or your breaker keeps tripping. The first two are answered by the nameplate figure. The third usually is not, and that is worth knowing before you go looking for a bigger number.

Two published figures out of five is a poor showing, and it is the honest state of the information. If you need the amperage for a unit that does not publish one, the nameplate on the unit itself carries it — it is molded or printed on the body, usually on the side of the motor housing — and that figure is authoritative in a way a buying guide never is.

A 1/2 HP disposal at 6.3 A and a 1 HP disposal at 7 A looks wrong if you expect amperage to scale with horsepower. It does not, for two reasons. First, these are running-load figures, not starting-current figures: an induction motor draws a large multiple of its running current for a fraction of a second as it starts, and that transient is what a breaker sees, not the steady 6.3 A. Second, the Waste King achieves 1 HP from a 2800 rpm permanent-magnet motor rather than a 1725 rpm induction motor, and the two motor types have quite different electrical characteristics.

The practical upshot is that horsepower is not a proxy for electrical load in this category, and you cannot infer one unit's amperage from another's. The garbage disposal horsepower guide explains what horsepower does and does not tell you.

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1. Lowest published draw

InSinkErator Badger 5

InSinkErator · Best for one or two people, tight cabinets

The baseline every other disposal is measured against, and an honest buy for a small household as long as you know what you are getting: half a horsepower, one grind stage, and galvanized steel grind components rather than stainless. It is short at 11-1/2", which is often the deciding factor in a shallow cabinet.

Published specifications

Motor

1/2 HP source

Grind stages

One source

Chamber capacity

26 oz source

Overall height

11-1/2" source

Grind components

Galvanized steel with stainless swivel lugs source

Motor speed

1725 rpm, 120 V, 60 Hz source

Warranty

5-year We Come to You in-home limited warranty source

What works

• +Shortest unit here at 11-1/2" — it fits cabinets a 1 HP unit cannot
• +Cheapest route to a working disposal from the brand with the best parts availability
• +Genuinely adequate for soft scraps: peelings, plate scrapings, coffee grounds
• +In-home warranty service rather than ship-it-back

What does not

• −Galvanized grind components, not stainless — this is the real difference between Badger and Evolution
• −One grind stage, so fibrous waste like celery and corn husks is where it stalls
• −No sound insulation of any kind, and the product page makes no noise claim

Skip it if

Skip it if you cook for four or more, or if anything fibrous goes down the drain. Buy 3/4 HP with three stages instead.

$110.90 · View on Amazon→

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Raw specifications: InSinkErator’s own page for the InSinkErator Badger 5.

Product photograph supplied by Amazon for this listing, used under the Associates program.

2. The 1 HP figure

Waste King Legend L-8000

Waste King · Best for value 1 hp with a cord fitted

A different engineering answer to the same problem: a 2800 rpm permanent-magnet motor instead of a slower induction motor with more grind stages. High speed rather than high torque, in a lighter and narrower body, with a 20-year warranty and a factory-fitted power cord. This is the value 1 HP unit.

Published specifications

Motor

1 HP permanent magnet, 2800 rpm source

Electrical

115 V, 60 Hz, 7 A source

Grind components

Stainless steel, with stainless swivel impellers source

Mounting

EZ Mount twist-and-lock sink flange source

Weight

11.94 lb source

Warranty

20-year limited warranty source

What works

• +2800 rpm is the highest motor speed here; speed does the work that extra grind stages do on an InSinkErator
• +Under 12 lb, which makes a one-person overhead installation genuinely possible
• +Power cord pre-attached — no separate cord kit, no wiring
• +A 20-year limited warranty at this price is unusual

What does not

• −High-speed permanent-magnet motors are louder in character than slow induction motors, and no party publishes a comparable decibel figure
• −Single-stage grinding, so output fineness is not comparable to a three-stage MultiGrind
• −Waste King's parts network is smaller than InSinkErator's

Skip it if

Skip it if grind fineness matters — on a septic system, for instance, where finer output is the whole point. Three stages beat high rpm there.

$149.27 · View on Amazon→

$165.5510% off

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Raw specifications: Waste King’s own page for the Waste King Legend L-8000.

Product photograph supplied by Amazon for this listing, used under the Associates program.

3. The one that does not publish it

InSinkErator Evolution .75HP

InSinkErator · Best for households of three to five

The disposal we would fit in most houses. Three-quarters of a horsepower with three-stage grinding and stainless grind components is the point on the range where fibrous waste stops being a gamble, and SoundSeal makes it noticeably quieter than a Badger. The nine-year in-home warranty is the longest of any InSinkErator continuous-feed unit we checked.

Published specifications

Motor

3/4 HP Dura-Drive induction source

Grind stages

Three-stage MultiGrind source

Grind components

Stainless steel source

Overall height

12.25" source

Sound

SoundSeal — quieter than a standard disposal source

Septic

Safe for properly maintained septic tanks source

Warranty

9-year We Come to You limited service warranty source

What works

• +Three grind stages and stainless components — the two specs that decide whether fibrous scraps jam
• +Only three-quarters of an inch taller than a Badger 5, so it fits most cabinets that took one
• +Nine-year in-home warranty, which is a real statement about expected service life
• +EZ Connect cord and hardwire adapter in the box, so it suits either wiring situation

What does not

• −InSinkErator publishes no decibel figure, and neither do we — SoundSeal is a comparison, not a measurement
• −3/4 HP still stalls on bones and fruit pits; no domestic disposal is a bone grinder
• −Chamber capacity is not published for this model

Skip it if

Skip it if you are one or two people who scrape plates and little else — you would be paying for capability you will not use.

$239.99 · View on Amazon→

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Raw specifications: InSinkErator’s own page for the InSinkErator Evolution .75HP.

An ordinary 120 V household branch circuit is rated at 15 A or 20 A, and both published disposal figures sit well inside that — a disposal is a small load that runs for seconds at a time. What matters is what else is on the circuit, and in a kitchen that can be a lot. The dishwasher is the one to think about, because it frequently shares a circuit with the disposal and it runs for an hour at a time with a heater in it.

A dedicated circuit for the disposal is therefore worth having, not because the disposal needs the capacity but because it isolates a motor load from everything else and stops a nuisance trip taking out the whole counter. Whether your installation requires one, what size it must be and whether GFCI or AFCI protection applies are code questions that vary by jurisdiction and by when the kitchen was wired. Ask a licensed electrician; we are not going to print a code rule we cannot cite.

If you are fitting a cord, use the one specified for your unit rather than a generic appliance lead — the gauge and the strain relief are part of the specification. The Waste King L-8000 arrives with its cord already attached. InSinkErator supplies an EZ Connect cord and a hardwire adapter in the box with the Evolution .75HP, which covers either installation. Do garbage disposals come with a power cord lists which do.

Worth knowing if your kitchen has no wall switch: an air switch does not carry the motor current at the button. The InSinkErator SinkTop Switch pushes air down a 6 ft tube to a relay module under the sink, which does the switching. That is why it can sit in a wet countertop, and it needs a 1-1/4 inch hole plus an existing AC outlet below — it switches power, it does not supply it. Air switches explained is the detail.

• 6.3 A is the published average load for the InSinkErator Badger 5 at 120 V, 60 Hz.
• 7 A is the published figure for the Waste King Legend L-8000 at 115 V, 60 Hz.
• Most models do not publish it. Read the nameplate on the unit — that figure is authoritative.
• Running current is not starting current. A motor draws a brief multiple of its rated amps as it starts, and that is what a breaker reacts to.
• Circuit sizing and protection are code questions. Both published figures fit an ordinary 15 A circuit, but whether yours needs a dedicated one is for a licensed electrician in your jurisdiction.